Clips sampling.
SAIL-VOS 3D contains videos whose number of frames ranges from single digits to several hundreds.
For our experiments, we sample fixed-length video clips satisfying the following rules: 1) the average occlusion ratio of the observed object is lower than 0.75 following [1]}. 2) the average visible instance area of the object is bigger than \(128\times 128\)  pixels.
In our training, we set the number of frames to be 17 following [2]}. If the length of the original video clip is shorter than 17, we duplicate beginning and ending frames to meet this requirement.
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